CC.cpp.in

/*
 * Copyright (C) 2024-2026  landerrosette <57791410+landerrosette@users.noreply.github.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

/******************************************************************************
 * % ./CC tinyG.txt
 * 3 components
 * 6 5 4 3 2 1 0
 * 8 7
 * 12 11 10 9
 *
 * % ./KosarajuSCC tinyDG.txt
 * 5 components
 * 1
 * 5 4 3 2 0
 * 12 11 10 9
 * 8 6
 * 7
 ******************************************************************************/

#include "algs4/@CC@.hpp"

#include <fstream>
#include <iostream>
#include <vector>

#include "algs4/Bag.hpp"

int main(int argc, char* argv[]) {
    if (argc < 2) {
        std::cerr << "Not enough arguments" << std::endl;
        return 1;
    }
    std::ifstream in(argv[1]);
    if (!in.is_open()) {
        std::cerr << "Cannot open file: " << argv[1] << std::endl;
        return 1;
    }
#ifndef DIRECTED
    algs4::Graph G(in);
#else
    algs4::Digraph G(in);
#endif
    algs4::@CC@ cc(G);
    int M = cc.count();
    std::cout << M << " components" << std::endl;
    std::vector<algs4::Bag<int>> components(M);
    for (int v = 0; v < G.V(); ++v) components[cc.id(v)].add(v);
    for (int i = 0; i < M; ++i) {
        for (int v : components[i]) std::cout << v << " ";
        std::cout << std::endl;
    }
    return 0;
}